Christina Aguilera and her suspiciously bodacious booty turned up to her baby daddy Matt Rutler's recent birthday bash and immediately sparked speculation that she has undergone some plastic surgery when it comes to the butt department.

The 34-year-old mom-of-two certainly seems to be packing a significant amount of more junk in her trunk—as they call it in the medical world—but, is it just imaginative padding....or, has she gone under the knife?

Popdust turned to celebrity plastic surgeon, Dr. Anthony Youn, to get the 411—and here is his expert findings.

Christina just 8 weeks ago (LEFT) and now (RIGHT)

"Christina's definitely got back! Her buttocks are almost impossibly round and full for her tiny size," Dr. Youn tells Popdust exclusively.

"I suspect that she may have had buttock enhancement via a Brazilian Butt Lift, where fat is injected into the behind to enhance it. Overall though, she looks great."

Aguilera has been the subject of plastic surgery speculation in the past—with reports that she has undergone a nose job, lip augmentation, breast implants and liposuction.

She has never broached the subject—with the exception of shooting down reports back in December 2013 that she underwent liposuction—insisting she dropped 35 pounds from her 5' 2" frame the good, old fashioned way.

"I am very frustrated today seeing reports that I got surgery to lose my baby weight!" Aguilera tweeted. "This is false. I worked so hard to train myself to eat right and healthy. I work out so hard."

Meanwhile, going by the recent pics, from the side, Xtina could be a Kardashian during one of their blonde phases, and we're guessing Matthew is not complaining!

Christina Aguilera has shared the first public photo of her 5-month-old daughter, Summer Rain—and, it’s evident that the apple hasn’t fallen far from the tree!

“Watch out… another one’s getting ready to conquer the world! #driven #diva2,” The Voice coach captioned the super cute photo of the little girl crawling on the carpet, clad in a pink dress and lace trimmed “Lil Diva” knickers.

As Popdust was first to report, the 34-year-old welcomed her first daughter last August—giving birth, via C-Section, in a private room at Los Angeles’ Cedars Sinai hospital, with fiancé, Matt Rutler, by her side.

Summer Rain is Xtina’s first child with Rutler— she’s also mom to 6-year-old son, Max, with ex-husband Jordan Bratman, whom she split from in October 2011, after nearly five years of marriage.

Aguilera and Rutler met on the set of Burlesque, they announced their engagement on Valentine’s Day last year, just one week before news broke that they were expecting a child together.

 

 

Christina Aguilera is a mommy again after welcoming a beautiful baby girl!

The 33-year-old gave birth today, via C-section, with babydaddy, Matt Rutler by her side, Popdust can exclusively reveal.

A well placed source tells Popdust Aguilera and Rutler arrived at Cedars Sinai at 8 am this morning to check in to her private, deluxe birthing suite and that everything went exactly to plan.

Xtina is already mom to son, Max, 6, from her marriage to Jordan Bratman—the couple split October 2010, their divorce was finalized April 2011.

It’s the first child for Rutler—who met Aguilera on the movie set of Burlesque, the couple announced their engagement Valentine’s Day, a week before sharing the news that they were expecting.

Meanwhile, Christina will be taking off season six of The Voice to spend some quality time with her growing family and concentrate on her music career.

Congratulations on the new addition, Christina, Matt and Max!

Matt Rutler gave girlfriend Christina Aguilera the best Valentine’s Day present a girl could ask for: An engagement ring!

The Dirrty singer accepted and took to her Twitter page to showcase her new rock—captioning the photo simply, “He asked and I said…”

This will be Xtina's second marriage—she was previously wed to producer Jordan Bratman from 2005-2010 and actually met Rutler on the set of the film Burlesque, just one month after she split from Bratman.

In short, she was with Brat, met Matt, divorced Brat.

Bratman and The Voice coach share custody of their six-year old son, Max.

"Matt and Max are crazy about each other. Matt is a real natural with kids," a source tells Popdust exclusively.

For now, the couple is shacked up in Christina's $10 million Los Angeles mansion.

Christina Aguilera boyfriend (for now) Matt Rutler smiles for the nice policeman after being arrested for DUI this morning. The police have declined to prosecute Aguilera for public intoxication. The couple was spotted having a late-night diner—and, according to TMZ, "one, possibly two, bottles of expensive wine—prior to the arrest.